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direct distance dialing

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noun
  1. a telephone network service feature enabling customers to direct-dial their long-distance calls.
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for direct distance dialing

direct distance dialing

noun
  1. US and Canadian a service by which telephone subscribers can obtain long-distance calls by dialling direct without the aid of an operatorBritish equivalent: subscriber trunk dialling
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012